Gravel Mixes (Substrate Group)

Component: Substrate

Unique Identifier: 269

Substrate Origin	Geologic Substrate
Substrate Class	Unconsolidated Mineral Substrate
Substrate Subclass	Coarse Unconsolidated Substrate
Substrate Group	Gravel Mixes
Substrate Subgroup	Sandy Gravel Muddy Sandy Gravel Muddy Gravel

Description

Definition

Geologic Substrate surface layer contains 30% to < 80% Gravel (particles 2 millimeters to < 4,096 millimeters in diameter). For more specificity in this group and in the following three substrate subgroups, the median size of "Gravel" may be substituted in, e.g., "Pebble Mixes", "Sandy Boulder", "Muddy Sandy Cobble", and "Muddy Granule".